Because all exchange users activity are recorded to a transaction log first before being written to the database, are the transaction logs being written to the EDB file before or after a full backup? Also, I have an exchange 2007 server with two hard disks. One for the OS and the other for the mailbox storage groups. Currently, the backups are scheduled to backup the OS hard disk first then the Mailbox storage group after. Because transaction logs are permanently deleted after a full backup would it be safe to say to change the sequence of backups to mailbox storage hard disk first then the OS?